Thomas midgley



T. MIDGLE Y. v

vcomma) MOLD AND FLUID BAG.

APPLI 1 ,321 I I Patented Nov. 11, 1 919.

ATTORNEYS.

mnoms MIDeLnY, or SPRINGFIELD, MASSACHUSETTS, assxenon TO THE FISK RUBBER COMPANY, OF CHICOPEEFALLS, 'MASSACHUSETTS, A CORPORATION OF MASSACHU- SETTS.

comanvnn MOLD AND FLUID-BAG.

Application filed-January 29, 1919. Serial No. 273,847.

- To all whom it may concern fluid bags, used in the cavities of tire casings to press the casings against the mold's dur ing vulcanization, as cldsed annular tubes roughly like inner tubes.

But this is not wholly desirable, since 'it is necessary in puttinga closed bag into the casing, to fold, buckle, or otherwise abuse it, which much shortens the life of the bag. The bag of the present invention. is open along its inner ings are compressed;

periphery, whereby the difliculty above referredto is obviated and the'bag is long wearing.

- When a casing is placed in the meld it is highly desirable that its bases shall be so tightly placed therein as to be highly compressed and compacted. 'The arrangement of the present invention has means for causing this compression, this provisionbeing closely related to, and coiiperating with, the

open bag in such a way that the open bag is rendered fluidtight and the bases are com pressed by the same operation.-

One obJect of my invention is to provide conveniently operable devices for-the,com-

pression of the bases of the tire casings.

'Another object is to provide an open fluid bag and cooperating devices, so .combined that when the mold is being closed the open fluid bag is closed and the bases of the cas To these ends, and also" to improve generally upon devices of the character indicated my invention consists in the following matters hereinafter described and claimed. Without restricting my invention thereto 1 show and describe it by reference to the devices illustrated in the accompanying drawings; and in these drawings Figure 1 is a radial cross section of an annular tire mold of usual construction, but provided with devices in accordance with my invention, a casing being shown in place practice to make the close, the bag.

'in the'mold, Withthe fluid bag received in the casing but not wholly inflated to expand t ante full pressing relation to the casing; an

Fig. 2 is a sideelevation of the expanding ring and its packing ring.

Patented Nov. 11, 1919.

The illustrated bag 1 is in the character cry open throughout its length. It is designed to be placed in the and'.expanded to press the casing against the mold M, it being, of course, no part of the casing,

but functioning "as the usual fluid bag.

The edges of the bag 1 are extended sulfiof an endless, annular, flexible tube of fab- I r10 and cured .rubber with its inner-periphciently to provide for their being folded back'beneath the bottoms of the bases B, B, ofthe casing C, as indicated at 2, 2.

Itwill be seen that the flexible open character 'of the bag adapts it for insertionin the casing readily and fwithout, crimping,

- wrinkling, buckling or the like, and hence gives the bag long life. Preferably, and

as shown, I prefer to make the bag slightly smaller, before inflation suflicient m stretch it, than the building size .of the casing, to additionally guard against buckling.

, An expansible ring, as the steel band 3,

split (aim/preferably scarfed) at 4 to per-.

mit expansion, is provided for combination with the bag 1. It is adapted to lie in the mold beneath the bases of the tire and bridging the open inn'Zr periphery of the bag, to

endless sheet of flexlble, yielding, and 'some-' acking element, 2 as the,

what stretchable, curedrubber 5, serving as a facing for the band 3, is provided. -Its function is to act as a packing between the band 3 and the folded back edges of the bag. Also the sheet serves to smoothly span .and seal the split 4 of the band.

The mold is provided with a pair of 7 cones 7', 7 which wedge into the circle of the band 3 as the mold is being closed, thereby to expand the 'band and compress, the

bases B, B. As here illustrated these cones are provided by expander members or rings 6, 6, fittedto the mold and beveled through:

out their peripheries.

This expansion of theband 3 serves two functions It brings the band 3, the pack ing sheet 5, and the folded back edges 2,

2, mto fluid tight and packed relation; and

it compresses the bases B, B of the casing,

with pressure exerted directly radially out War-1 on the bases in the ideal manner, And

it will be noted that these two functions are erformed simultaneously.

It will be seen that the arrangement pro vides that the folded back edges of the bag .are grasped" and held between two comthe casing to mold M. It will beseen I which utilizes an "stantially no tend ing ofthe bag; provides When the partsare in place, the bag is inflated -as is-the usual bag, say by a valve 8- carried by the band 3, the, arrangement being fluid. tight, and expanded to press v that I have provided an arrangement of the character indicated ogen fluid bag; has sub- 7 cy to wear the edges of the bag; provides'for the fluid tight closof the bases of the casing; provides for the.

v "simultaneous performance of these two last in combination,

. in combination,

'e'xpansible named operations;. and which, 'withahfis simple and comparatively inexpensive to manufacture.

W'r-iat I claim is 1. In a device of the character indicated, a pair of annular mold halves presenting 'each a cavity, the two adapted to receive a tire casing having a. pair of bases, a fluid bag to be receivediin said casing, and open beneath the adjacent base of the casing, an ing to lie in said mold beneath the bases of the casing and beneath said turned-back edges, and bridging the open innerperiphery of said bag, a packing element to lie between said ring and said edges, and an expander-cone carried by each mold half in position to be inserted in said ringto expand the same upon closing of said mold; substantially as described.

2. In adevice of the character indicated,

a pair of mold-halves presenting a cavity adapted to receive a'tire casing having a pair of bases, 9, fluid bag to be received in said casing and open along 'Ioperatively related to said for the compression along its inner periphv, ery and having its'edges adapted to lie eaclr' its inner periphery and havingdts, edges adapted to lie each. beneath the adjacent base of the casing, and means operable upon the approach of-said mold-halves to'force said edges into fluid tight'relation with the bases of the casing; substantially as described.

3.. In a device of the character indicated, in combination, a pairof mold-halves pre'-' senting a cavity adapted'to receive a'jtire casing having a pair of bases andmeans mold-halves t0 adially compress said bases, thererbeing an perative connection between said means and" said mold-halves for operating said- 'means by said mold-halves by and during the approach of said mold-halves, to radially 'compress'the'bases of said casing; substantially asdescribed.

4. In a device of the character indicated, in combination, a pair'of. mold-halves pre senting a cavity adapted to receive a tire casing-having a pair of bases, a fluid bag to be received in said casing and open along its inner periphery and having its edges adapted to lie each beneath the adjacent base of the casing, compressingmeans to lie in said mold beneath. the bases of the-casing, and beneath said edges'and bridging the open inner periphery of said bag, and means for operating said. compressing means to compress the bases of the casing and grasp said edges upon-the closing of said mold; substantially as described. 4, l 5. In a device of thecharacter indicated,. in combination, a fluid bag for insertion in a tire casing and inflation therein to press upon said casing,'said bag having'an-ope'ning-therealong to permit its easy insertion in the casing, and having portions along the edges of said openingand extending away from said opening in wing-form, and in a direction'substantially crosswiseof the opening, to thereby adapt them to lie beneath the bases of the casing and a device of a widthadapting. it to lie across said-- extcnd to each side thereof in a direction opening and in packed relation to said p'ortions, thereby to close saidbag; substantially as described. I

THOMAS MIDGLEY, 

